Bending device for bar iron



Jan. 1, 1924 A. WAGENBACH BENDING DEVICE' FOR BAR IRON Filed June 17. 1921 5 sheets-sheet 1 Fig.1.

Jan. 1, 1924 A. WAGENBACH BENDING DEVICE FOR BAR IRON 3 Shoots-Shoot 2 Filed June 17 1921 v l I- Erik Jan. 1 1924' A. WAGENBACH BENDING DEVICE FOR BAR IRON 3 Shuts-Sheet 5 Patented Jan. 1, 1924.

UNITE ANTON WAGENBACH, E ELBERFELD,- GERMANY.

BENDING DEVICE FOR BAR IRON.

Application filed .Tune 17,

1921. Serial No. 478,370.

(GRANTED UNDER THE rnovxsmn's or THE ACT or MARcn 2, 1921, 41 STAT. I.., 1313.

1921, il -50780 I/49f), of which the following 1s a specification.

In bending devices for concrete iron and other iron bars the use of a bending lever is known which is moved over a bearing plate and which in connection with stops which can be inserted in said plate permits the bending of iron in various desired shapes. In these cases the bending lever is generally operated by hand. On the'other hand bending machines driven by motor power for bending heavier iron are known in which the bending lever can be run in either direction by a motor, in order to bend the iron held by a guide into any desired shape. In this case the disadvantage exists that the iron held in the guide can only be bent at the end, and when, for in stance, the iron intended to brace the concrete is to be bent at the other end, it must be taken out of the guide, swung around in a large circuit and then again inserted at the other end in the guide, a considerable amount of time and space being required for handling the iron bars which are usually very long.

on the contrary, consists in a bending. machine with a lever run by motor power in both directions in which the latter and the plate in which the stops are inserted are so fitted on both sides with holes or devices for receiving such stops that as a result of the ability to work in both directions both ends of the bars can be bent in succession by simply inserting the iron once into the machine.

An important improvement of the new bending device consists in providing the eccentric serving as holder for the iron to be bent in the usual manner corresponding to the symmetry attained by the reversibility of the machine, with a cogged indented surface fitting a correspondingly cogged fundamental plate upon which it can be pressed by a pressing device. This rigid adjustabil- The essential part of the present invention,

ity of the eccentric in the firstplace permits of widest adjustability to the thinnest as well as to the thickest iron and furthermore a secure grip on same is obtained even when the gripping device is subjected to strains in various directions as a result of reversing the bending lever. Hereby the eccentric together with the poppet with which it fixes the iron, can be united 011 a common foundation plate carrying in turn a peg or other gripping device for insertion into the soleplate, thereby permitting of easy and quick changing.

The drawing shows two examples of the new motor-run bendingdevice, as follows:

Fig. 1 is a side view of the entire machine of the first constructional form.

Fig. 2 is a front View.

Fig. 3 is a top view of the machine with one position of the bending lever with in-' dications of the various bendings of one iron bar end.

Fig. .4 is a similar view showing various bendings of the other iron bar end.

Fig. 5 is a side View partly in section of the gripping eccentric.

Fig. 6 is a top view of the design shown in 5.

Fig. 7 shows a constructional form in which the machine is driven by a directly connected electric motor.

The machine carries on a fundamental frame 2 resting on four wheels 1 an upper frame 3 on which in turn is a sole plate 4. Between the fundamental frame 2 and the sole plate 4 a bending shaft 5 is journalled, on which the bending lever 6 is keyed.

The bending shaft 5 is driven by an electric motor by means of a pulley 36 driving a horizontal intermediate shaft 10. The horizontal intermediate shaft 10 engages by means of a bevel gear wheel 11 two other bevel gear wheels 12, 13 which can be alternately connected with a perpendicular intermediate shaft 15 by means of a disengaging clutch 14 consisting of a sleeve slidably mounted, on the intermediate shaft 15 r arm, is provided which can be swung baclt and forth by means of the hand lever 18' equipped with a correspondingly arched rack, for variously engaging the clutch 1d, and bearing a crossbar 19 for locking in the various positions, which drops and catch locks in the pinion 20.

The bending shaft 5 projects through the bending lever 6 with a journal on which rollers'2l or various sizes for efiecti'ng various radii o1 curvature can be fitted. The bending lever 6 is provided with a number of holes 22 at varying distances from the bending axis and in which the bending pegs 23 are inserted. The soleplate & contains square holes 24' in which the gripping eccentrics (Figs. 6, 7) are held. This gripping device consists of a fundamental plate 25 with pegs 26' fitting into the square holes, and on said fundamental plate on one hand a pin 2'?" is provided with interchangeable roller 28 and on the other hand the real eccentric 29. The eccentric 29 which is built as a symmetric double eccentric, is inserted on a pin 30, on the fundamental plate 25 and is provided with a set of teeth 3i which it into a similar circular set of teeth 32 in the fundamental plate 25-. it. nut 33 serves to keep the teeth tightly locked together.

On the sole plate l are finally two cross ledges 3 1- containing a large number of holes 35 into which bolts may be inserted for attaching iron angle brackets and similar stops for bending purposes.

The machine is operated as follows:

When it is desired to bend a piece of iron, this is first oil all secured in the manner shown in Fig. at by the eccentric 29 inserted to the right and properly adjusted, whereupon the curve a is bent between the principal roller 21 and a bolt lying close by inserted in the bending lever-(3. Thus the roller 28 permits a shifting of the iron in bending, so that the curve is bent as it on a cylinder and can be performed even on heavy iron without any impermissible distortions. The iron is hereafter drawn through to position 7) or the hook and by placing the bending bolt 23 into the place indicated in Fig. 42, the form 0 is given to the iron. A bolt inserted in one of the holes 35 or an iron angle bracket secured by means of same serves as a bending stop, so

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that the double curvature is accomplished by a single turn of the bending lfever.

In order to bend the other end of the same iron bar, the eccentric 29 is placed in the position shown in Fig. 5 whereupon after drawing the iron through, the curve cl is bent, the position of the bending lever being shown in the drawing. After drawing the curve through to the position 6 either the bending to position f is effected, or after drawing and turning the iron further it is bent to position g, else the double bending indicated by it may also be accomplished. This double bending can, of course, be performed by a single movement 01. the bending lever as shown also in 4 and any other desired bendings can be accomplished.

As in the case of long iron bars and such as have already been bent, it is necessary to avoid turning the iron, the eccentric maybe inserted in any other or the holes 2st, as, for instance, in the upper row of at and by reversing the mechanism of the bending lever 6, any bendings in an opposite direction can be performed.

In the constructional formshown in Fig. 7 on the fundamental frame 2, an electric motor '7 is arran ed which is governed by starter 8, and drives the intermediate shaft ll), by aid of toothed wheels 9'. In all other respects the machine is built and handled in the same manner as the first described machine. 9

Having now particularly described and ascertained my said invention, what I claim and desire to secure by Letters Patent of the United States is:

Bending device for bar iron,-co1nprisin-g in combination a motor, a driving gear, a bending lever arranged to be driven by the said motor in both directions, a sole plate provided with holes on opposite ends and stops arranged to be received in the said holes to enable the work to be inserted in the machine in either direction, and an eccentric serving as poppet tor the iron provided with an indented bottom surface, a device on the sole plate provided with an indented or corrugated surface into which the said bottom surface of the eccentric can be pressed, and a pressing mechanism.

In witness whereof I aliix my signature.

ANTON /VAGENBAOH. 

